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Media Type
5,987
texts
521
audio
386
movies
21
images
10
data
3
concerts
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Topics & Subjects
2,598
ERIC Archive
2,386
NASA Technical Reports Server (NTRS)
1,872
Feedback
1,869
FEEDBACK CONTROL
853
Feedback (Response)
816
FEEDBACK
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Collection
2,598
Education Resources Information Center (ERIC) Archive
2,386
NASA Network Resource and Training Site
371
Community Audio
289
Community Video
258
NASA Technical Documents
236
The Magazine Rack
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Creator
2,598
eric
2,386
nasa technical reports server (ntrs)
218
defense technical information center
213
huda tv
36
keith hughes
27
non
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6,282
English
3
German
2
Arabic
2
Urdu
1
Asturian
1
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